  // =========平台部分less样式============ 
  //-------- screen -----------
  @screen-xs: 480px;
  @screen-sm: 576px;
  @screen-md: 768px;
  @screen-lg: 992px;
  @screen-xl: 1200px;
  @screen-xxl: 1600px;
  @screen-xxxl: 1920px;
  

  